Sugar Loaf view

The Grwyne Fawr is a river in the Brecon Beacons National Park in south Wales. A section of it forms the administrative border between Powys and Monmouthshire and also of the historic counties of Brecon and Monmouth. The river and its major tributary the Grwyne Fechan flow into the River Usk at Glangrwyney.

Y Graig, three miles west of Abergavenny, is the site of an abandoned settlement, known to have been occupied in the 18th and 19th centuries. It is a Scheduled Ancient Monument in the care of Cadw.